package NC105_二分查找2;

import java.util.*;


public class Solution {
    /**
     * 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
     *
     * 如果目标值存在返回下标，否则返回 -1
     * @param nums int整型一维数组
     * @param target int整型
     * @return int整型
     */
    public int search (int[] nums, int target) {
        // write code here
        if (nums == null || nums.length == 0){
            return -1;
        }
        int left = 0;
        int right = nums.length - 1;
        while (left <= right){
            int mid = left + (right - left) / 2;
            if (nums[mid] < target){
                left = mid + 1;
            }else if (nums[mid] > target){
                right = mid - 1;
            }else {
                while (mid > 0 && nums[mid] == nums[mid - 1]){
                    mid--;
                }
                return mid;
            }
        }
        return -1;
    }
}